Joseph walter



(No Model.)

J. WALTER.

SPEAKING TUBE ANNUNG'IATOR. No. 294.535. Patented Mar. 4, 1884.

WITNESSES:. INVENTOR I W BY M ATTORNEY Un'rrnn S'rarns ATENT 'rincn.

JOSEPH \VALTER, OF NEXV YORK, N. Y.

SPEAKING TUBE. ANNUNCIATOR.

SPECIFICATION forming part of Letters Patent No. 294,535, dated March 4, 1884.

Application filed Januaryfll, 1884.

IO heretofore under date of September 26,,1882,

No. 264,977, the improvements being designed with aview to simplify the construction of the annunciator and render the same cheaper and more effective.

The invention consists of a speakingtube annunciator, the S-shaped main tube of which is provided with a mouth-piece at one end and a valve at the other enlarged end, said valve being provided with an exterior striker that rings a bell or gong attached to the main tube whenever an airwave is passed through the speaking-tube from the farther end of the same. The striker operates by a fixed arm a pivoted indicator, the position of which indicates whenever a signal has beengiven.

In the accompanying drawings, Figure 1 represents a rear elevation of my improved speaking-tube annunciator; Fig. 2, a side view, and Fig. 3 a vertical longitudinal section, of

the same.

Similar letters of reference indicate corresponding parts.

A in the drawings represents the S-shaped main tube of my improved annunciator,wl1ich 3 5 is provided at one end with a mouth-piece,A.

- At the opposite end of the main tube A is arranged a valve, B, which, when at rest, does not close the entire orifice of the main tube A, but leaves an opening, 2), below the valve of sufficientsizetopermit communicationthrough the speaking-tube in the direction of the arrow, Fig. For this purpose that part of the tube Abelow the valve B is enlarged near the opening. The pivot d of the valve B is extended 5 laterally through the side wall of the tube A,

and provided at its outer end witha striker, O, the laterally-bent front end of which is provided with a hammer that strikes a bell or gong, D, that' is applied to the front wall of 5o-the tube A. The striker G is stopped in one,

direction by the enlargement A at the lower (No model.)

end of the tube A, said enlargement furnishing the required space by which communication is established below the valve. The striker O is stopped in the other direction by an in-' wardly-proiect'ing stop-pin, a, which projects into the path of the valve, the position of the pin a being such that the hammer strikes the gong when the valve B has attained a sufficient impulse from the air-wave. The valve B in striking against the stop-pin a acts in the nature of a spring and causes the striker to rebound, so as not to stick to the gong by the air-=pressu re, which would dull the sound of the gong. The front wall of the tube A is concentric to the pivot of the valve B, so that the latter closes the speakingtube when it has passed the enlargement A, so th at the striker is thrown up against the bell. The bell D is supported on a bent post, D, that is secured to one of the side walls of the tube A.

\Vhen communication is desired to be established through the speaking-tube, a wave of air is blown into the mouth-piece through the conducting-tube, the air-wave traveling through the speaking-tube until arriving at the opposite end, where it impinges upon the valve B and throws the same suddenly from its vertical pendent position into an inclined position, as

shown in'dotted line in Fig. 3, so that its hammer strikes the bell. By blowing several times in succession into the speaking-tube, these airwaves are repeated, and thereby the gong struck quickly in succession, whereby a signal is given at the opposite end of the tube, and thereby attention drawn to the fact that communication is desired. Owing to the concentric shape of the tube A, avery light air-wave causes the valve B to oscillate beyond and above the enlargement A The striker G lifts by a fixed arm, 6, a pivoted indicator, E, and throws it up on an inclined stop 011 rest 0 at the side of the tube, as shown in dotted lines in Fig. 2. This position of the indicator shows that a call has been made, even if the gong-signal has not been heard. After the party has communicated through the speaking-tube the indicator is thrown back in its former position, so as to be ready for the next signal. As an annuir ciator is arranged at each en (1 of the speakingtube, the alarm can be given from either end.

The annunciator may also be arranged in as new and desire to secure by Letters Patent 1. In an annnnciatoriorspeaking-tubes, the combination of a main tube having an enlargement at one end, a 'alve pivoted to the enlarged end, said valve being smaller than its enlarged end, a striker, 0, attached to the outer end of the valve-pivot, and a gong secured to the main tube A, substantially as set forth.

The combination of a tube, A, having a mouthpiece, A, at one end and an enlargement, Afl-at the other end, a valve, B, pivoted to the enlarged end, an exterior striker, O, attached to the pivot of the valve, a gong, D, attached to the tube A, and means whereby the striker O is stopped in either direction, sub stantially as specified.

3. The combination, with a main tube, A, having a mouthpiece, A, at one end and an enlargement, A at its opposite end, a valve, 1-3, pivoted to the enlarged end, a-striker, (1, attached to the pivot of the valve, a gong, D, secured to the tube A, a pivoted indicator, i operated by the striker, and a stop or rest, 0, for the indicator, substantially as set forth.

'lIlrtestimon'y that I claim the foregoing as myinvention I have signed my name in presence of two subscribing witnesses.

JOSEPH \VALTER. lVitnesses:

PAUL Gonrnt, SIDNEY MANN. 

